<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        
    </style>
</head>
<body>
    
</body>
<script>

    console.log(Math.round(3.6));

    console.log(Math.ceil(3.00001));

    console.log(Math.floor(3.999999));

    console.log(Math.max([23,56,14,78,16]));
    console.log(Math.max(23,56,14,78,16));

    console.log(Math.min(23,56,14,78,16));

    console.log(Math.pow(4, 2));

    console.log(Math.sqrt(2));

    console.log(Math.abs(-34));

    console.log(Math.random());


    console.log(Math.sin( 90 / (180 / Math.PI) ));
    console.log(Math.cos( 90 / (180 / Math.PI) ));
    console.log(Math.tan( 90 / (180 / Math.PI) ));

    // hu = jiao / (180 / pai)

    console.log(Math.PI);


</script>
</html>